6685961 has 2 divisors, whose sum is σ = 6685962. Its totient is φ = 6685960.

The previous prime is 6685933. The next prime is 6685963. The reversal of 6685961 is 1695866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5148361 + 1537600 = 2269^2 + 1240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6685961 is a prime.

Together with 6685963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6685963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342980 + 3342981.

It is an arithmetic number, because the mean of its divisors is an integer number (3342981).

Almost surely, 2^6685961 is an apocalyptic number.

It is an amenable number.

6685961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6685961 is an equidigital number, since it uses as much as digits as its factorization.

6685961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 6685961 is about 2585.7225295843. The cubic root of 6685961 is about 188.3885975251.

The spelling of 6685961 in words is "six million, six hundred eighty-five thousand, nine hundred sixty-one".